阅读说明：本技术 正极活性物质粒子 (Positive electrode active material particles ) 是由 高桥正弘 落合辉明 门马洋平 鹤田彩惠 于 2018-05-01 设计创作，主要内容包括：提供一种劣化少的正极活性物质粒子。或者,提供一种劣化少的蓄电装置。或者,提供一种安全性高的蓄电装置。一种正极活性物质粒子包括第一晶粒、第二晶粒及位于第一晶粒与第二晶粒间的晶界,其中第一晶粒及第二晶粒包含锂、过渡金属及氧,晶界包含镁和氧,并且该正极活性物质具有晶界中的镁的原子浓度与第一晶粒及第二晶粒中的过渡金属的原子浓度比为0.010以上且0.50以下的区域。(Provided is a positive electrode active material particle which is less deteriorated. Alternatively, a power storage device with less deterioration is provided. Alternatively, a highly safe power storage device is provided. A positive electrode active material particle includes a first crystal grain, a second crystal grain, and a grain boundary between the first crystal grain and the second crystal grain, wherein the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen, the grain boundary includes magnesium and oxygen, and the positive electrode active material has a region in which a ratio of an atomic concentration of magnesium in the grain boundary to an atomic concentration of the transition metal in the first crystal grain and the second crystal grain is 0.010 or more and 0.50 or less.)

1. A positive electrode active material particle comprising:

A first crystal grain;

A second crystal grain; and

A grain boundary between the first crystal grain and the second crystal grain,

Wherein the first crystal grain and the second crystal grain comprise lithium, a transition metal, and oxygen,

The grain boundaries comprise magnesium and oxygen,

The grain boundary has a region having a higher magnesium concentration than the first crystal grain and the second crystal grain.

2. The positive electrode active material particle according to claim 1, wherein a region in which a ratio of an atomic concentration of the magnesium to an atomic concentration of the transition metal is 0.010 or more and 0.50 or less is present.

3. The positive electrode active material particle according to claim 1 or 2, wherein the grain boundary further contains fluorine, and the grain boundary has a region with a higher fluorine concentration than the first crystal grain and the second crystal grain.

4. The positive electrode active material particle according to claim 3, wherein a region in which the atomic concentration ratio of the fluorine to the transition metal is 0.020 or more and 1.00 or less is present.

5. The positive electrode active material particle according to claim 1 or 2, wherein the transition metal contains any one or more of iron, cobalt, nickel, manganese, chromium, titanium, vanadium, and niobium.

Technical Field

One embodiment of the invention relates to an article, a method, or a method of manufacture. Alternatively, one embodiment of the present invention relates to a process (process), machine (machine), product (manufacture), or composition (machine). One embodiment of the present invention relates to a method for manufacturing a semiconductor device, a display device, a light-emitting device, a power storage device, a lighting device, or an electronic apparatus. In particular, the present invention relates to a positive electrode active material that can be used for a secondary battery, and an electronic device having the secondary battery.

Note that in this specification, the power storage device refers to all elements and devices having a power storage function. For example, a storage battery such as a lithium ion secondary battery (also referred to as a secondary battery), a lithium ion capacitor, an electric double layer capacitor, and the like are included in the category of the power storage device.

Note that in this specification, the electronic device refers to all devices including a power storage device, and an electro-optical device including a power storage device, an information terminal device including a power storage device, and the like are electronic devices.

Background

In recent years, various power storage devices such as lithium ion secondary batteries, lithium ion capacitors, and air batteries have been increasingly studied and developed. In particular, with the development of the semiconductor industry of new-generation clean energy vehicles such as mobile phones, smart phones, laptop personal computers, and the like, portable music players, digital cameras, medical devices, Hybrid Electric Vehicles (HEV), Electric Vehicles (EV), plug-in hybrid electric vehicles (PHEV), and the like, the demand for high-output, large-capacity lithium ion secondary batteries has been increasing dramatically, and these lithium ion secondary batteries have become indispensable items in modern information-oriented society as chargeable energy supply sources.

Therefore, in order to improve the cycle characteristics and increase the capacity of lithium ion secondary batteries, improvement of positive electrode active materials has been studied (patent documents 1 and 2).

Further, as characteristics required for the power storage device, there are improvements in safety and long-term reliability under various operating environments.

[ Prior Art document ]

[ patent document ]

[ patent document 1] Japanese patent application laid-open No. 2012-018914

[ patent document 2] Japanese patent application laid-open No. 2016-

Disclosure of Invention

Technical problem to be solved by the invention

It is desired to improve the capacity, cycle characteristics, charge/discharge characteristics, reliability, safety, cost, and the like of a lithium ion secondary battery and a positive electrode active material used for the same.

In view of the above problems, an object of one embodiment of the present invention is to provide positive electrode active material particles with less deterioration. Another object of one embodiment of the present invention is to provide a novel positive electrode active material particle. Another object of one embodiment of the present invention is to provide a power storage device with less deterioration. Another object of one embodiment of the present invention is to provide a power storage device with high safety. Another object of one embodiment of the present invention is to provide a novel power storage device.

Note that the description of the above object does not hinder the existence of other objects. In addition, one embodiment of the present invention does not necessarily achieve all of the above-described objects. The objects other than the above can be extracted from the descriptions of the specification, the drawings, the claims, and the like.

Means for solving the problems

The positive electrode active material particle according to one embodiment of the present invention includes a first crystal grain, a second crystal grain, and a grain boundary between the first crystal grain and the second crystal grain, where the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen, and the grain boundary includes magnesium and oxygen.

The positive electrode active material particles preferably have a region in which the atomic concentration ratio of magnesium to the atomic concentration of the transition metal is 0.010 to 0.50.

In the positive electrode active material particles, the grain boundary preferably further contains fluorine.

The positive electrode active material particles preferably have a region in which the atomic concentration ratio of fluorine to the atomic concentration of the transition metal is 0.020 or more and 1.00 or less.

In the positive electrode active material particles, the transition metal preferably contains at least one of iron, cobalt, nickel, manganese, chromium, titanium, vanadium, and niobium.

effects of the invention

According to one embodiment of the present invention, a positive electrode active material particle with less deterioration can be provided. In addition, a novel positive electrode active material particle can be provided. Further, it is possible to provide an electric storage device with less deterioration. Further, a power storage device with high safety can be provided. In addition, a novel power storage device can be provided.